How to convert square miles to square feet
To convert a measurement in square miles to square feet, multiply the value by 27,878,400. The conversion factor comes from the relationship between both units and the square meter.
For example, to convert 5 mi² to square feet: 5 × 27,878,400 = 139,392,000 ft².
What is a square mile?
A square mile is an imperial and US customary unit of area equal to the area of a square one mile on each side, or 640 acres, about 2.59 square kilometers. The square mile is the traditional unit for large land areas in the US and UK. In the US Public Land Survey System, a 'section' is exactly one square mile, the building block of the township grid.
Common uses of square miles include: Areas of US and UK cities and counties; Land survey sections (640 acres); Geographic and census area reporting; Property and ranch land in imperial countries.
What is a square foot?
A square foot is an imperial and US customary unit of area equal to the area of a square one foot on each side, about 0.0929 square meters. The square foot is the dominant unit for floor area in US and UK real estate, where home and office sizes are quoted in square feet. It remains the everyday area unit throughout the imperial world.
Common uses of square feet include: Home and office floor area in the US and UK; Real estate listings and rent per square foot; Flooring, tiling, and paint coverage; Retail and commercial space sizing.
Square Miles to square feet worked examples
Here are some common values converted:
1 mi² = 27,878,400 ft² 5 mi² = 139,392,000 ft² 10 mi² = 278,784,000 ft² 50 mi² = 1,393,920,000 ft² 100 mi² = 2,787,840,000 ft²
Frequently asked questions
How many square feet are in one square mile?
One square mile (mi²) equals 27,878,400 square feet (ft²). Multiply any value in square miles by 27,878,400 to convert to square feet.
How do I convert square miles to square feet?
Multiply the value in square miles by 27,878,400. For example, 5 mi² × 27,878,400 = 139,392,000 ft².
How do I convert square feet to square miles?
Multiply the value in square feet by 0.00000003587, or divide by 27,878,400. Use the swap button on the converter above to reverse the direction.
Is the square mile to square foot conversion exact?
Yes. Area conversions derive from the exact 1959 international definitions of the meter, yard, and foot, so the factors are exact.
What is the formula for square miles to square feet?
The formula is: ft² = mi² × 27,878,400. This comes from the definition of both units relative to the square meter.